GGtag is a reusable, reprogrammable ePaper-based badge with RFID.
Side note: It would be cool to allow exchange of payment information (such as lightning invoice) through sound rather than NFC.
https://www.hackster.io/news/ggtag-is-a-reusable-reprogrammable-epaper-based-badge-with-rfid-c9aed6b7ddd0
It sounds cool (no pun intended), but is there any practical advantage to using sound?
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